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PDF ADP3309 Data sheet ( Hoja de datos )
| Número de pieza | ADP3309 | |
| Descripción | 100 mA Low Dropout Linear Regulator | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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FEATURES
±1.2% accuracy over line and load regulations @ 25°C
Ultralow dropout voltage: 120 mV typical @ 100 mA
Requires only COUT = 0.47 μF for stability
anyCAP LDOs are stable with all types of capacitors
(including MLCC)
Current and thermal limiting
Low noise
Low shutdown current: 1 μA
2.8 V to 12 V supply range
−20°C to +85°C ambient temperature range
Several fixed voltage options
Ultrasmall 5-lead SOT-23 package
Excellent line and load regulations
APPLICATIONS
Cellular telephones
Notebook, palmtop computers
Battery-powered systems
PCMCIA regulator
Bar code scanners
Camcorders, cameras
GENERAL DESCRIPTION
The ADP3309 is a member of the ADP330x family of precision
low dropout anyCAP voltage regulators. It is pin-for-pin and
functionally compatible with National’s LP2981, but offers
performance advantages. The ADP3309 stands out from
conventional LDOs with a novel architecture and an enhanced
process. Its patented design requires only a 0.47 μF output
capacitor for stability. This device is stable with any type of
capacitor regardless of its equivalent series resistance (ESR)
value, including ceramic types for space restricted applications.
The ADP3309 achieves ±1.2% accuracy at room temperature
and ±2.2% overall accuracy over temperature, line, and load
regulations. The dropout voltage of the ADP3309 is only
120 mV (typical) at 100 mA. This device also includes a current
limit and a shutdown feature. In shutdown mode, the ground
current is reduced to ~1 μA.
anyCAP® 100 mA
Low Dropout Linear Regulator
ADP3309
IN
ERR/NC
SD
FUNCTIONAL BLOCK DIAGRAM
Q1 ADP3309
THERMAL
PROTECTION
Q 2 DRIVER
CC
gm
BANDGAP
REF
OUT
R1
R2
GND
Figure 1.
The ADP3309 operates with a wide input voltage range from
2.8 V to 12 V and delivers a load current in excess of 100 mA.
The ADP3309 anyCAP LDO offers a wide range of output
voltages.
ERR/NC
VIN
C1 +
0.47µF –
4
ADP3309-3.3
1 IN
OUT 5
32
ON
OFF
+
–
VOUT = 3.3V
C2
0.47µF
SD GND
Figure 2. Typical Application Circuit
Rev. C
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2006 Analog Devices, Inc. All rights reserved.
1 page  
ADP3309
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
IN 1
5 OUT
ADP3309
GND 2 TOP VIEW
(Not to Scale)
SD 3
3 ERR/NC
NC = NO CONNECT
Figure 3. Pin Configuration
Table 3. Pin Function Descriptions
Pin No. Mnemonic Description
1 IN
Regulator Input.
2 GND
Ground Pin.
3 SD
Active Low Shutdown Pin. Connect to ground to disable the regulator output. When shutdown is not used, this
pin should be connected to the input pin.
4
ERR/NC
Open Collector. Output that goes low to indicate the output is about to go out of regulation. This pin can be left
open. (NC = No Connect).
5 OUT
Output of the Regulator. Fixed 2.5 V, 2.7 V, 2.85 V, 2.9 V, 3.0 V, 3.3 V, or 3.6 V output voltage. Bypass to ground with
a 0.47 μF or larger capacitor.
Rev. C | Page 5 of 12
5 Page 
ADP3309
APPLICATION CIRCUITS
CROSSOVER SWITCH
The circuit in Figure 23 shows that two ADP3309s can be used
to form a mixed supply voltage system. The output switches
between two different levels selected by an external digital
input. Output voltages can be any combination of voltages from
the Ordering Guide of the data sheet.
VIN = 4V TO 12V
OUTPUT SELECT
4V
0V
IN OUT
ADP3309-2.7
SD GND
VOUT = 2.7V/3.3V
VIN = 4V TO 8V C1
47µF
MJE253*
R1
50Ω
VOUT = 3.3V @ 1A
IN OUT
ADP3309-3.3
SD ERR
GND
+ C2
10µF
*AAVID531002 HEAT SINK IS USED
Figure 24. Higher Output Current Linear Regulator
CONSTANT DROPOUT POST REGULATOR
C1 +
1µF
IN OUT
ADP3309-3.3
+ C2
0.47µF
SD GND
Figure 23. Crossover Switch
The circuit in Figure 25 provides high precision with low
dropout for any regulated output voltage. It significantly
reduces the ripple from a switching regulator while providing a
constant dropout voltage, which limits the power dissipation of
the LDO to 30 mW. The ADP3000 used in this circuit is a
switching regulator in the step-up configuration.
HIGHER OUTPUT CURRENT
The ADP3309 can source up to 100 mA without any heat sink
or pass transistor. If higher current is needed, an appropriate
pass transistor can be used, as in Figure 24, to increase the
output current to 1 A.
VIN = 2.5V TO 3.5V
L1
6.8µF
D1
1N5817
C1
100µF
10V
R1
120Ω
ILIM VIN SW1
ADP3000-ADJ
FB
GND SW2
C2
100µF
10V
R2
30.1kΩ
1%
Q1
2N3906
R3
124kΩ
1%
ADP3309-3.3
IN OUT
SD GND
VOUT = 3.3V @ 100mA
+
Q2
2N3906
C3
2.2µF
R4
274kΩ
Figure 25. Constant Dropout Post Regulator
Rev. C | Page 11 of 12
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet ADP3309.PDF ] | |
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